docs: enable some useful rustdoc features on docs.rs (#28) #92

Job	Run time
test ubuntu-latest stable --no-default-features	27s
feature-checks	39s
test ubuntu-latest stable	18s
clippy	41s
doctest	52s
test ubuntu-latest stable --all-features	31s
test ubuntu-latest nightly --no-default-features	26s
no-std	22s
wasm-unknown	19s
test ubuntu-latest nightly	28s
wasm-wasi	19s
test ubuntu-latest nightly --all-features	34s
test ubuntu-latest 1.81 --no-default-features	24s
fmt	12s
docs	29s
test ubuntu-latest 1.81	27s
test windows-latest stable --no-default-features	2m 13s
test windows-latest stable	1m 9s
test windows-latest stable --all-features	2m 27s
test windows-latest nightly --no-default-features	1m 10s
test windows-latest nightly	1m 14s
test windows-latest nightly --all-features	1m 32s
test windows-latest 1.81 --no-default-features	2m 3s
test windows-latest 1.81	1m 6s
deny / cargo deny check	14s
	20m 36s

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